All the Weyrs of Pern (Pern)

All the Weyrs of Pern by Anne McCaffrey is tenth book in the Dragons of Pern books, which began with Dragonflight.

At the end of the last book (chronologically, not by publish date but in the time of Pern) Jaxon and Ruth found part of the original settlement. Contained within this facility is the computer Aivas, an artificial intelligence that has been waiting almost 2500 years to hear what happened to the settlers, when they fled the southern continent.

Now Aivas will help the dragonriders, craft halls and holders catch up on the technology that was lost. All in an attempt to destroy Thread forever.

McCaffrey, Anne. (1991). All the Weyrs of Pern. New York: Del Rey.